Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* net/atm/proc.c - ATM /proc interface |
| 2 | * |
| 3 | * Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA |
| 4 | * |
| 5 | * seq_file api usage by romieu@fr.zoreil.com |
| 6 | * |
| 7 | * Evaluating the efficiency of the whole thing if left as an exercise to |
| 8 | * the reader. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/config.h> |
| 12 | #include <linux/module.h> /* for EXPORT_SYMBOL */ |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/mm.h> |
| 16 | #include <linux/fs.h> |
| 17 | #include <linux/stat.h> |
| 18 | #include <linux/proc_fs.h> |
| 19 | #include <linux/seq_file.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/atm.h> |
| 22 | #include <linux/atmdev.h> |
| 23 | #include <linux/netdevice.h> |
| 24 | #include <linux/atmclip.h> |
| 25 | #include <linux/init.h> /* for __init */ |
| 26 | #include <net/atmclip.h> |
| 27 | #include <asm/uaccess.h> |
| 28 | #include <asm/atomic.h> |
| 29 | #include <asm/param.h> /* for HZ */ |
| 30 | #include "resources.h" |
| 31 | #include "common.h" /* atm_proc_init prototype */ |
| 32 | #include "signaling.h" /* to get sigd - ugly too */ |
| 33 | |
| 34 | static ssize_t proc_dev_atm_read(struct file *file,char __user *buf,size_t count, |
| 35 | loff_t *pos); |
| 36 | |
| 37 | static struct file_operations proc_atm_dev_ops = { |
| 38 | .owner = THIS_MODULE, |
| 39 | .read = proc_dev_atm_read, |
| 40 | }; |
| 41 | |
| 42 | static void add_stats(struct seq_file *seq, const char *aal, |
| 43 | const struct k_atm_aal_stats *stats) |
| 44 | { |
| 45 | seq_printf(seq, "%s ( %d %d %d %d %d )", aal, |
| 46 | atomic_read(&stats->tx),atomic_read(&stats->tx_err), |
| 47 | atomic_read(&stats->rx),atomic_read(&stats->rx_err), |
| 48 | atomic_read(&stats->rx_drop)); |
| 49 | } |
| 50 | |
| 51 | static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev) |
| 52 | { |
| 53 | int i; |
| 54 | |
| 55 | seq_printf(seq, "%3d %-8s", dev->number, dev->type); |
| 56 | for (i = 0; i < ESI_LEN; i++) |
| 57 | seq_printf(seq, "%02x", dev->esi[i]); |
| 58 | seq_puts(seq, " "); |
| 59 | add_stats(seq, "0", &dev->stats.aal0); |
| 60 | seq_puts(seq, " "); |
| 61 | add_stats(seq, "5", &dev->stats.aal5); |
| 62 | seq_printf(seq, "\t[%d]", atomic_read(&dev->refcnt)); |
| 63 | seq_putc(seq, '\n'); |
| 64 | } |
| 65 | |
| 66 | struct vcc_state { |
| 67 | int bucket; |
| 68 | struct sock *sk; |
| 69 | int family; |
| 70 | }; |
| 71 | |
| 72 | static inline int compare_family(struct sock *sk, int family) |
| 73 | { |
| 74 | return !family || (sk->sk_family == family); |
| 75 | } |
| 76 | |
| 77 | static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l) |
| 78 | { |
| 79 | struct sock *sk = *sock; |
| 80 | |
| 81 | if (sk == (void *)1) { |
| 82 | for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) { |
| 83 | struct hlist_head *head = &vcc_hash[*bucket]; |
| 84 | |
| 85 | sk = hlist_empty(head) ? NULL : __sk_head(head); |
| 86 | if (sk) |
| 87 | break; |
| 88 | } |
| 89 | l--; |
| 90 | } |
| 91 | try_again: |
| 92 | for (; sk; sk = sk_next(sk)) { |
| 93 | l -= compare_family(sk, family); |
| 94 | if (l < 0) |
| 95 | goto out; |
| 96 | } |
| 97 | if (!sk && ++*bucket < VCC_HTABLE_SIZE) { |
| 98 | sk = sk_head(&vcc_hash[*bucket]); |
| 99 | goto try_again; |
| 100 | } |
| 101 | sk = (void *)1; |
| 102 | out: |
| 103 | *sock = sk; |
| 104 | return (l < 0); |
| 105 | } |
| 106 | |
| 107 | static inline void *vcc_walk(struct vcc_state *state, loff_t l) |
| 108 | { |
| 109 | return __vcc_walk(&state->sk, state->family, &state->bucket, l) ? |
| 110 | state : NULL; |
| 111 | } |
| 112 | |
| 113 | static int __vcc_seq_open(struct inode *inode, struct file *file, |
| 114 | int family, struct seq_operations *ops) |
| 115 | { |
| 116 | struct vcc_state *state; |
| 117 | struct seq_file *seq; |
| 118 | int rc = -ENOMEM; |
| 119 | |
| 120 | state = kmalloc(sizeof(*state), GFP_KERNEL); |
| 121 | if (!state) |
| 122 | goto out; |
| 123 | |
| 124 | rc = seq_open(file, ops); |
| 125 | if (rc) |
| 126 | goto out_kfree; |
| 127 | |
| 128 | state->family = family; |
| 129 | |
| 130 | seq = file->private_data; |
| 131 | seq->private = state; |
| 132 | out: |
| 133 | return rc; |
| 134 | out_kfree: |
| 135 | kfree(state); |
| 136 | goto out; |
| 137 | } |
| 138 | |
| 139 | static int vcc_seq_release(struct inode *inode, struct file *file) |
| 140 | { |
| 141 | return seq_release_private(inode, file); |
| 142 | } |
| 143 | |
| 144 | static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) |
| 145 | { |
| 146 | struct vcc_state *state = seq->private; |
| 147 | loff_t left = *pos; |
| 148 | |
| 149 | read_lock(&vcc_sklist_lock); |
| 150 | state->sk = (void *)1; |
| 151 | return left ? vcc_walk(state, left) : (void *)1; |
| 152 | } |
| 153 | |
| 154 | static void vcc_seq_stop(struct seq_file *seq, void *v) |
| 155 | { |
| 156 | read_unlock(&vcc_sklist_lock); |
| 157 | } |
| 158 | |
| 159 | static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 160 | { |
| 161 | struct vcc_state *state = seq->private; |
| 162 | |
| 163 | v = vcc_walk(state, 1); |
| 164 | *pos += !!PTR_ERR(v); |
| 165 | return v; |
| 166 | } |
| 167 | |
| 168 | static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) |
| 169 | { |
| 170 | static const char *class_name[] = { "off","UBR","CBR","VBR","ABR" }; |
| 171 | static const char *aal_name[] = { |
| 172 | "---", "1", "2", "3/4", /* 0- 3 */ |
| 173 | "???", "5", "???", "???", /* 4- 7 */ |
| 174 | "???", "???", "???", "???", /* 8-11 */ |
| 175 | "???", "0", "???", "???"}; /* 12-15 */ |
| 176 | |
| 177 | seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", |
| 178 | vcc->dev->number,vcc->vpi,vcc->vci, |
| 179 | vcc->qos.aal >= sizeof(aal_name)/sizeof(aal_name[0]) ? "err" : |
| 180 | aal_name[vcc->qos.aal],vcc->qos.rxtp.min_pcr, |
| 181 | class_name[vcc->qos.rxtp.traffic_class],vcc->qos.txtp.min_pcr, |
| 182 | class_name[vcc->qos.txtp.traffic_class]); |
| 183 | if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) { |
| 184 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); |
| 185 | struct net_device *dev; |
| 186 | |
| 187 | dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL; |
| 188 | seq_printf(seq, "CLIP, Itf:%s, Encap:", |
| 189 | dev ? dev->name : "none?"); |
| 190 | seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None"); |
| 191 | } |
| 192 | seq_putc(seq, '\n'); |
| 193 | } |
| 194 | |
| 195 | static const char *vcc_state(struct atm_vcc *vcc) |
| 196 | { |
| 197 | static const char *map[] = { ATM_VS2TXT_MAP }; |
| 198 | |
| 199 | return map[ATM_VF2VS(vcc->flags)]; |
| 200 | } |
| 201 | |
| 202 | static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) |
| 203 | { |
| 204 | struct sock *sk = sk_atm(vcc); |
| 205 | |
| 206 | seq_printf(seq, "%p ", vcc); |
| 207 | if (!vcc->dev) |
| 208 | seq_printf(seq, "Unassigned "); |
| 209 | else |
| 210 | seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, |
| 211 | vcc->vci); |
| 212 | switch (sk->sk_family) { |
| 213 | case AF_ATMPVC: |
| 214 | seq_printf(seq, "PVC"); |
| 215 | break; |
| 216 | case AF_ATMSVC: |
| 217 | seq_printf(seq, "SVC"); |
| 218 | break; |
| 219 | default: |
| 220 | seq_printf(seq, "%3d", sk->sk_family); |
| 221 | } |
| 222 | seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", vcc->flags, sk->sk_err, |
| 223 | atomic_read(&sk->sk_wmem_alloc), sk->sk_sndbuf, |
| 224 | atomic_read(&sk->sk_rmem_alloc), sk->sk_rcvbuf, |
| 225 | atomic_read(&sk->sk_refcnt)); |
| 226 | } |
| 227 | |
| 228 | static void svc_info(struct seq_file *seq, struct atm_vcc *vcc) |
| 229 | { |
| 230 | if (!vcc->dev) |
| 231 | seq_printf(seq, sizeof(void *) == 4 ? |
| 232 | "N/A@%p%10s" : "N/A@%p%2s", vcc, ""); |
| 233 | else |
| 234 | seq_printf(seq, "%3d %3d %5d ", |
| 235 | vcc->dev->number, vcc->vpi, vcc->vci); |
| 236 | seq_printf(seq, "%-10s ", vcc_state(vcc)); |
| 237 | seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub, |
| 238 | *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : ""); |
| 239 | if (*vcc->remote.sas_addr.prv) { |
| 240 | int i; |
| 241 | |
| 242 | for (i = 0; i < ATM_ESA_LEN; i++) |
| 243 | seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]); |
| 244 | } |
| 245 | seq_putc(seq, '\n'); |
| 246 | } |
| 247 | |
| 248 | static int atm_dev_seq_show(struct seq_file *seq, void *v) |
| 249 | { |
| 250 | static char atm_dev_banner[] = |
| 251 | "Itf Type ESI/\"MAC\"addr " |
| 252 | "AAL(TX,err,RX,err,drop) ... [refcnt]\n"; |
| 253 | |
| 254 | if (v == (void *)1) |
| 255 | seq_puts(seq, atm_dev_banner); |
| 256 | else { |
| 257 | struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); |
| 258 | |
| 259 | atm_dev_info(seq, dev); |
| 260 | } |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | static struct seq_operations atm_dev_seq_ops = { |
| 265 | .start = atm_dev_seq_start, |
| 266 | .next = atm_dev_seq_next, |
| 267 | .stop = atm_dev_seq_stop, |
| 268 | .show = atm_dev_seq_show, |
| 269 | }; |
| 270 | |
| 271 | static int atm_dev_seq_open(struct inode *inode, struct file *file) |
| 272 | { |
| 273 | return seq_open(file, &atm_dev_seq_ops); |
| 274 | } |
| 275 | |
| 276 | static struct file_operations devices_seq_fops = { |
| 277 | .open = atm_dev_seq_open, |
| 278 | .read = seq_read, |
| 279 | .llseek = seq_lseek, |
| 280 | .release = seq_release, |
| 281 | }; |
| 282 | |
| 283 | static int pvc_seq_show(struct seq_file *seq, void *v) |
| 284 | { |
| 285 | static char atm_pvc_banner[] = |
| 286 | "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; |
| 287 | |
| 288 | if (v == (void *)1) |
| 289 | seq_puts(seq, atm_pvc_banner); |
| 290 | else { |
| 291 | struct vcc_state *state = seq->private; |
| 292 | struct atm_vcc *vcc = atm_sk(state->sk); |
| 293 | |
| 294 | pvc_info(seq, vcc); |
| 295 | } |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static struct seq_operations pvc_seq_ops = { |
| 300 | .start = vcc_seq_start, |
| 301 | .next = vcc_seq_next, |
| 302 | .stop = vcc_seq_stop, |
| 303 | .show = pvc_seq_show, |
| 304 | }; |
| 305 | |
| 306 | static int pvc_seq_open(struct inode *inode, struct file *file) |
| 307 | { |
| 308 | return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops); |
| 309 | } |
| 310 | |
| 311 | static struct file_operations pvc_seq_fops = { |
| 312 | .open = pvc_seq_open, |
| 313 | .read = seq_read, |
| 314 | .llseek = seq_lseek, |
| 315 | .release = vcc_seq_release, |
| 316 | }; |
| 317 | |
| 318 | static int vcc_seq_show(struct seq_file *seq, void *v) |
| 319 | { |
| 320 | if (v == (void *)1) { |
| 321 | seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", |
| 322 | "Address ", "Itf VPI VCI Fam Flags Reply " |
| 323 | "Send buffer Recv buffer [refcnt]\n"); |
| 324 | } else { |
| 325 | struct vcc_state *state = seq->private; |
| 326 | struct atm_vcc *vcc = atm_sk(state->sk); |
| 327 | |
| 328 | vcc_info(seq, vcc); |
| 329 | } |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | static struct seq_operations vcc_seq_ops = { |
| 334 | .start = vcc_seq_start, |
| 335 | .next = vcc_seq_next, |
| 336 | .stop = vcc_seq_stop, |
| 337 | .show = vcc_seq_show, |
| 338 | }; |
| 339 | |
| 340 | static int vcc_seq_open(struct inode *inode, struct file *file) |
| 341 | { |
| 342 | return __vcc_seq_open(inode, file, 0, &vcc_seq_ops); |
| 343 | } |
| 344 | |
| 345 | static struct file_operations vcc_seq_fops = { |
| 346 | .open = vcc_seq_open, |
| 347 | .read = seq_read, |
| 348 | .llseek = seq_lseek, |
| 349 | .release = vcc_seq_release, |
| 350 | }; |
| 351 | |
| 352 | static int svc_seq_show(struct seq_file *seq, void *v) |
| 353 | { |
| 354 | static char atm_svc_banner[] = |
| 355 | "Itf VPI VCI State Remote\n"; |
| 356 | |
| 357 | if (v == (void *)1) |
| 358 | seq_puts(seq, atm_svc_banner); |
| 359 | else { |
| 360 | struct vcc_state *state = seq->private; |
| 361 | struct atm_vcc *vcc = atm_sk(state->sk); |
| 362 | |
| 363 | svc_info(seq, vcc); |
| 364 | } |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static struct seq_operations svc_seq_ops = { |
| 369 | .start = vcc_seq_start, |
| 370 | .next = vcc_seq_next, |
| 371 | .stop = vcc_seq_stop, |
| 372 | .show = svc_seq_show, |
| 373 | }; |
| 374 | |
| 375 | static int svc_seq_open(struct inode *inode, struct file *file) |
| 376 | { |
| 377 | return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops); |
| 378 | } |
| 379 | |
| 380 | static struct file_operations svc_seq_fops = { |
| 381 | .open = svc_seq_open, |
| 382 | .read = seq_read, |
| 383 | .llseek = seq_lseek, |
| 384 | .release = vcc_seq_release, |
| 385 | }; |
| 386 | |
| 387 | static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, |
| 388 | size_t count, loff_t *pos) |
| 389 | { |
| 390 | struct atm_dev *dev; |
| 391 | unsigned long page; |
| 392 | int length; |
| 393 | |
| 394 | if (count == 0) return 0; |
| 395 | page = get_zeroed_page(GFP_KERNEL); |
| 396 | if (!page) return -ENOMEM; |
| 397 | dev = PDE(file->f_dentry->d_inode)->data; |
| 398 | if (!dev->ops->proc_read) |
| 399 | length = -EINVAL; |
| 400 | else { |
| 401 | length = dev->ops->proc_read(dev,pos,(char *) page); |
| 402 | if (length > count) length = -EINVAL; |
| 403 | } |
| 404 | if (length >= 0) { |
| 405 | if (copy_to_user(buf,(char *) page,length)) length = -EFAULT; |
| 406 | (*pos)++; |
| 407 | } |
| 408 | free_page(page); |
| 409 | return length; |
| 410 | } |
| 411 | |
| 412 | |
| 413 | struct proc_dir_entry *atm_proc_root; |
| 414 | EXPORT_SYMBOL(atm_proc_root); |
| 415 | |
| 416 | |
| 417 | int atm_proc_dev_register(struct atm_dev *dev) |
| 418 | { |
| 419 | int digits,num; |
| 420 | int error; |
| 421 | |
| 422 | /* No proc info */ |
| 423 | if (!dev->ops->proc_read) |
| 424 | return 0; |
| 425 | |
| 426 | error = -ENOMEM; |
| 427 | digits = 0; |
| 428 | for (num = dev->number; num; num /= 10) digits++; |
| 429 | if (!digits) digits++; |
| 430 | |
| 431 | dev->proc_name = kmalloc(strlen(dev->type) + digits + 2, GFP_KERNEL); |
| 432 | if (!dev->proc_name) |
| 433 | goto err_out; |
| 434 | sprintf(dev->proc_name,"%s:%d",dev->type, dev->number); |
| 435 | |
| 436 | dev->proc_entry = create_proc_entry(dev->proc_name, 0, atm_proc_root); |
| 437 | if (!dev->proc_entry) |
| 438 | goto err_free_name; |
| 439 | dev->proc_entry->data = dev; |
| 440 | dev->proc_entry->proc_fops = &proc_atm_dev_ops; |
| 441 | dev->proc_entry->owner = THIS_MODULE; |
| 442 | return 0; |
| 443 | err_free_name: |
| 444 | kfree(dev->proc_name); |
| 445 | err_out: |
| 446 | return error; |
| 447 | } |
| 448 | |
| 449 | |
| 450 | void atm_proc_dev_deregister(struct atm_dev *dev) |
| 451 | { |
| 452 | if (!dev->ops->proc_read) |
| 453 | return; |
| 454 | |
| 455 | remove_proc_entry(dev->proc_name, atm_proc_root); |
| 456 | kfree(dev->proc_name); |
| 457 | } |
| 458 | |
| 459 | static struct atm_proc_entry { |
| 460 | char *name; |
| 461 | struct file_operations *proc_fops; |
| 462 | struct proc_dir_entry *dirent; |
| 463 | } atm_proc_ents[] = { |
| 464 | { .name = "devices", .proc_fops = &devices_seq_fops }, |
| 465 | { .name = "pvc", .proc_fops = &pvc_seq_fops }, |
| 466 | { .name = "svc", .proc_fops = &svc_seq_fops }, |
| 467 | { .name = "vc", .proc_fops = &vcc_seq_fops }, |
| 468 | { .name = NULL, .proc_fops = NULL } |
| 469 | }; |
| 470 | |
| 471 | static void atm_proc_dirs_remove(void) |
| 472 | { |
| 473 | static struct atm_proc_entry *e; |
| 474 | |
| 475 | for (e = atm_proc_ents; e->name; e++) { |
| 476 | if (e->dirent) |
| 477 | remove_proc_entry(e->name, atm_proc_root); |
| 478 | } |
| 479 | remove_proc_entry("net/atm", NULL); |
| 480 | } |
| 481 | |
| 482 | int __init atm_proc_init(void) |
| 483 | { |
| 484 | static struct atm_proc_entry *e; |
| 485 | int ret; |
| 486 | |
| 487 | atm_proc_root = proc_mkdir("net/atm",NULL); |
| 488 | if (!atm_proc_root) |
| 489 | goto err_out; |
| 490 | for (e = atm_proc_ents; e->name; e++) { |
| 491 | struct proc_dir_entry *dirent; |
| 492 | |
| 493 | dirent = create_proc_entry(e->name, S_IRUGO, atm_proc_root); |
| 494 | if (!dirent) |
| 495 | goto err_out_remove; |
| 496 | dirent->proc_fops = e->proc_fops; |
| 497 | dirent->owner = THIS_MODULE; |
| 498 | e->dirent = dirent; |
| 499 | } |
| 500 | ret = 0; |
| 501 | out: |
| 502 | return ret; |
| 503 | |
| 504 | err_out_remove: |
| 505 | atm_proc_dirs_remove(); |
| 506 | err_out: |
| 507 | ret = -ENOMEM; |
| 508 | goto out; |
| 509 | } |
| 510 | |
| 511 | void __exit atm_proc_exit(void) |
| 512 | { |
| 513 | atm_proc_dirs_remove(); |
| 514 | } |